CarnationSailor wrote:
Yes, you will need a drill bit for drilling metal and make it a good quality one. Buy a 1/8-inch bit and a self-tapping screw appropriate for the hole (drill) size. The hardware store clerk should be able to help you choose a good drill bit, properly sized screw, and center punch (if you don't have one).
If you doubt your current drill can do the job, buy a good quality cordless drill. You will need it again if you continue to RV.
(You will be drilling from the bottom up.)
Start by using the center punch to mark the place next to the existing mounting point where you are going to drill. Hit the center punch firmly once or twice with a hammer after cutting a small circle out of the coroplast (so you can see the "dimple" made by the center punch). The "dimple" produced by the center punch will keep the drill bit from wandering around when you first start drilling. Drill a hole and attach the bracket with the self-tapping screw.
Good luck!
And wear safety goggles if you are under it drilling up!